Evidence
6 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-6).
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[1]research packet 1034-packet.md [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERDICT: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-yms-146-yms146-pkt-1034-packet-md
-
[2]NavSource Online, Mine Warfare Vessel Photo Archive, YMS-146 (live page verified 2026-10-04) [other_primary]
- Locator
- YMS-146 page, timeline and specifications blocks
- Finding type
- vessel_history
- Finding
- NavSource identifies YMS-146 as a YMS-1-class auxiliary motor minesweeper with call sign Nan-Xray-Dog-William; laid down 1942-06-19 by San Diego Marine Construction Co. at San Diego, launched 1942-09-30, and completed 1943-06-23. It records sinking off Okinawa in Typhoon Louise on 1945-10-09, striking from the Naval Register on 1946-01-03, and destruction. Its specification block gives 270 tons displacement, 136-foot length, 24-foot 6-inch beam, 8-foot draft, 15-knot speed, complement 32, one 3-inch/50 mount, two 20mm mounts, two depth-charge projectors, and two 800-bhp General Motors 8-268A diesels with Snow and Knobstedt single-reduction gear and two shafts. The page states that no DANFS history is available for YMS-146.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1942-1946
- Population
- San Diego Marine construction trades (1942-43); YMS-146 crew (1943-45)
- Limitations
- NavSource is a secondary compilation and does not document asbestos content. Its completion date is not treated as a commissioning date. The page does not establish the precise wreck location, individual exposure, asbestos presence, or causation.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-146-yms146-01
-
[3]National Archives, Special List 44, by Ship Numbers (PDF) [other_primary]
- Locator
- PDF page 115; extracted line for YMS-146
- Finding type
- historical_record
- Finding
- NARA's Special List 44 records U.S. Navy deck-log coverage for YMS-146 from 1943-06-23 through 1945-12-10.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1943-06-23 to 1945-12-10
- Population
- YMS-146 crew and shipboard operations during the indexed log period
- Limitations
- This is a records-coverage index, not a transcription of the logs and not evidence of commissioning or decommissioning dates. NARA's asbestos guide states that deck logs can help identify work dates but do not directly establish asbestos use or presence; the individual logs were not examined for this record.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-146-yms146-02
-
[4]National Archives, Researching Asbestos aboard US Naval Vessel up through 1961 [other_primary]
- Locator
- Beginning Research; General Information Books; Other Records and their usefulness
- Finding type
- regulatory
- Finding
- NARA identifies the official archival routes for determining asbestos aboard an individual Navy vessel, including RG 19 Bureau of Ships hull correspondence, Minesweeper and Minelayer General Information Books (RG 19 Entry P 11), specifications, engineering drawings, and related inspection records. It also explains that deck logs do not directly establish asbestos presence, though they may narrow dates for major work.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-10-04
- Study period
- 1941-1961
- Population
- U.S. Navy vessels and shipyard/maintenance research, 1941-1961
- Limitations
- Research pathway only; no YMS-146 RG 19 file, general information book, specification, drawing, or inspection report was located or examined. This source does not establish or negate asbestos aboard YMS-146.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-146-yms146-03
-
[5]U.S. GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (1979) [gao]
- Locator
- Highlights and full-report summary; HRD-80-2 PDF
- Finding type
- gov_survey
- Finding
- GAO reviewed asbestos use in Navy ships and reported that asbestos was used in ship components, with thermal insulation as the Navy's major use; it also described the Navy's 1975 policy to remove and replace asbestos insulation when damaged or when necessary repairs required removal, modified in 1979 for selected high-maintenance areas.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1975-1979 policy review
- Population
- Navy shipyard workers and Navy vessels
- Limitations
- Navy-wide and shipyard-program context, not a YMS-146 record. It does not establish that asbestos was installed aboard this hull, what products were used, what remained after 1945, or any individual's exposure. The live GAO product page and linked full report were verified.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-146-yms146-04
-
[6]Batch-8823 source and litigation sweep result: no qualifying ship-specific asbestos record located in the sources searched; CourtListener sweep halted after the helper reported fleet-wide pacing budget spent. [other_primary]
- Locator
- search_ledger rows sl-uss-yms-146-yms146-01 through -09
- Finding type
- historical_record
- Finding
- No ship-specific asbestos survey, abatement record, hazmat disclosure, product identification, material specification, or qualifying asbestos-litigation finding naming USS YMS-146/YMS-146 was located in the public sources searched. The result is a negative finding about the research record, not proof that asbestos was absent.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04 research session
- Limitations
- The CourtListener sweep is incomplete: the authenticated helper was invoked for the exact-name opinion base query, then reported that the fleet-wide pacing budget was momentarily spent; the remaining three required base queries were not run and no asbestos variants were run. The negative finding therefore must not be read as a clean litigation negative. NARA's undigitized RG 19 pathways remain open leads.
- Atlas source
- true
- Evidence ID
- ev-uss-yms-146-yms146-05